Quantitative Aptitude - Arithmetic Ability Questions

In 250 litres mixture of soda and water the ratio of amount of soda to that of water is 7 : 18. In order to make this ratio 2 : 3, how many more litres of soda should be added?

If a - b = -6 and a2 + b2 = 44, then ab is

If x2+y2+z2-8x+6y-4z+29 = 0, then find the value of z(x+y).

If cotA/√(1 + cot2A) = x, then the value of x is

A shop keeper allows 20% discount on the marked price on his articles. Find the marked price of an article for which he charges Rs. 740

What is 0.53 + 0.53equal to ?

The income of X is 60% more than Y’s income and the income of Y is 40% more than Z’s income. X’s income is how much percentage more than Z’s income?

If cosαcosβ=m and cosαsinβ=n,then the value of m2+n2 cos2β is